Hi Trond, Thanks for the prompt reply! I find that in _nfs_do_open(), _nfs4_proc_open(), which do the RPC call to the remote server, is always called before nfs4_opendata_to_nfs4_state(), which will further invoke nfs4_try_open_cached(). Does this means that whenever is file is opened, the client always need to talk to the server first? Thanks! best, Yudong On Mon, Jul 12, 2010 at 2:48 PM, Trond Myklebust <trond.myklebust@xxxxxxxxxx> wrote: > On Mon, 2010-07-12 at 14:37 -0700, Yudong Gao wrote: >> Hi, >> >> I am reading the NFS source code of the file open function in kernel >> 2.6.34, but I cannot find any implementation with delegation to allow >> client to open a file locally without contacting the server. We are >> tying to use delegation to do something interesting. So I am wondering >> how much delegation support specified in the NFS 4.1 protocol is >> available in the current Linux implementation? > > What's wrong with nfs4_try_open_cached()? It even works with NFSv4.0... > > Trond > > -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
